Engine-exhaust tester



m M S m ST E Tmw H HM J W ll Gi NF E Dec. 20, 1927.

Patented Dec. 20, 1927;

UNITED STATES PATENT OFFICE.

EDGAR J. KA'IES, OF NEW ROCHELLE, NEW YORK, ASSIGNOR TO DE LA VERGNEMACHINE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

' ENGINE-EXHAUST TESTER.

Application filed August 22, 1924 serial No. 733,483.

This invention provides a simple and in I expensive means for testingthe condition of the exhaust gas of internal combustion engines andconsistsin an attachment to the engine, as below described, whichcapable of application to internal combustion engines of variousdesigns, and by means of which the condition of the internalcom bustioncan be readily determined, being especially useful in multi cylinderengines wherein it greatly facilitates the adjustment the inlet valve ismarked 1, the exhaust valve 2 and the exhaust, pipe 8. The usualwater-cooled cylinder head is *novided with a hole 1 leading throughtheacketed space into the exhaust gas passage, as close as possible tothe exhaust valve itself. This hole is normally closed by a tubular plughaving a knurled head 5 and a closed inner end which projects throughthe hole into thepath of the exhaust gas. For a distance just below theknurled head, the plug shank is tapered, as indicated at 6, to make agase tight fit in the outer end of the hole, closing it completely.Thehollow plug forms a well subject to the temperature of the 6X- haustgas and is intended and adapted to receive the bulb end of athermometer, such. as indicated at 7. With the thermometer so placed thetemperature of the exhaust can,

be easily observed. By removing the plug the exhaust gas will issue fromthe hole so as to be observable as to color, sound and smell, therebyalso giving an index, useful to those skilled in the art, as to the character of the combustion occurring in the engine cylinder. The diameterof the plug inward of its tapered part, is considerably smaller than thehole through the engine wall, thereby forming an annulargas space whichinsulates the plug from the surrounding metal and thereby minimizesescape of heat from the inner endof the well, correspondingly enhancingthe accuracy of the temperature indication.

The exact point oflocation of the hole/t is of course accommodated tothe engine design and may be located at any convenient I point adequatefor producing the indicia referred to, in the head, or exhaustypiping,

as desired. In multicylinder, engines one such plug is used for eachcylinder, the

single thermometer serving for all of them; When placed in a verticalposition as indicated, the weight of the plug alone is sufficient tokeep it in place against the internal gas pressure and it is accordinglyvery quickly removed when it is desired to allow the exhaust to escape.

I claim: j

1. An engine testing device comprising the combination with an enginehaving an exhaust passage the wall of which has a gas test aperture, ofa tubular closure plug having a quickly detachable connection with thewall of the apertureand adapted to contain i a thermometer, a head onthe plug upstanding away from the wall of the aperture and forming ahand grip by which the plug may be detached from the engine without theuseof tools whereby the quality and temperature of the exhaust gas canbe simultaneously ascertained. 2. An engine testing device as claimed inclaim 1, in which the weight of said plug exceeds the exhaust pressurethereagainst, whereby the plugis held in contact with the Wall of theaperture by gravity only.

3. An engine testing device as claimed in claim 1, in which the plug isprovided with an aperture-closing seat adapted to engage the wall of theaperture adjacent the outer spaced from the wall of the aperture.

In testimony whereof, I have signed this specification.

EDGAR J. KATES.

